is pressed An electric disk sander (see Fig. against a surface with a force of 50 N. The coefficient of friction between the sandpaper and the surface is 0.6 and the diameter of the sanding disk is 200 mm. Determine the torque that the motor must develop to overcome the de- veloped friction. 50 N 200 mm

is pressed An electric disk sander (see Fig. against a surface with a force of 50 N. The coefficient of friction between the sandpaper and the surface is 0.6 and the diameter of the sanding disk is 200 mm. Determine the torque that the motor must develop to overcome the de- veloped friction. 50 N 200 mm

International Edition---engineering Mechanics: Statics, 4th Edition

4th Edition

ISBN:9781305501607

Author:Andrew Pytel And Jaan Kiusalaas

Publisher:Andrew Pytel And Jaan Kiusalaas

Chapter7: Dry Friction

Section: Chapter Questions

Problem 7.57P: The square-threaded screw with a pitch of 10 mm and a mean radius of 18 mm drives a gear that has a...

See similar textbooks

Similar questions

Calculate the horizontal force P required to push the 85-lb lawn mower at constant speed. The center of gravity of the mower is at G, and the coefficients of rolling resistance are 0.12 for the front wheels and 0.18 for the rear wheels.
The square-threaded screw with a pitch of 10 mm and a mean radius of 18 mm drives a gear that has a mean radius of 75 mm. The static and kinetic coefficients of friction between the gear and the screw are 0.12 and 0.06, respectively. The input torque applied to the screw is C0=10Nm. Assuming constant speed operation, determine the output torque C1 acting on the gear.
Repeat Prob. 4.152 assuming that the 400-kN force is applied at O instead of L.
The normal pressure acting on the disk of the sander is given by p=(4/3)+(r2/6), where p is the pressure in pounds per square inch (psi) and r represents the radial distance in inches. Determine the torque C required to operate the sander at constant speed if the kinetic coefficient of friction for the surface being sanded is 0.86.
The cone clutch transmits the torque C through a conical friction surface with cone angle . The inner and outer radii of the friction surface are a and b, respectively. The left half of the clutch is keyed to the shaft, and the right half drives a machine (not shown) through a gear attached to its outer rim. Assuming uniform pressure on the friction surface, show that the maximum torque that can be transmitted by the clutch is
A horizontal force P acts on the top of the 30 N block having a width of 25 cm and a height of 50 cm. If the coefficient of friction between the block and the plane is 0.33. a. What is the value of P for motion to impend? b. Is the motion will impend due to overturning? Show your solution.
A body of weight 450 N is pulled up along an inclined plane having inclination 30° to the horizontal at a steady speed. Find the force required if the co-efficient of friction between the body and the plane is 0.25
Q3/ A screw-jack is used to lft a load of 4 kN. The screw of the screw-jack is square threaded with two threads to 1 cm. If the co-efficient of friction between the nut and screw is 0,095 and outer diameter of screw s 6 cm, find the force required atthe end of the handle of length 50 cm to ift the load. (20 M)
A block P of weight 50 N is kept on a plane and now pulled so that the extension in the spring is 10 cm. The stiffness of the spring is 4 N/cm and the coefficient of friction between the block and the plane is μ = 0.3. Find the maximum compression in the spring.
The ladder in the figure rests on a horizontal surface (point A) and a vertical wall (point B). The coefficient of static friction between the ladder and the horizontal surface is ??, while the friction of the ladder with the vertical wall is negligible. Assuming that the center of gravity of the ladder is at half its length, determine the minimum value of ??, to ensure that the ladder remains at rest.
The maximum static friction for a material in contact with a rough surface 2 is 10kN. Determine the minimum force that would make an impending motion to the material.
A flywheel is made up of steel ring 40mm thick and 200mm wide plate with mean diameter of 2 metres. If initially the flywheel is rotating at 300r.p.m. Find the time taken by the wheel in coming to rest due to frictional couple of 100N.m. Take mass density of the steel as 7900kg/m3. Neglect the effect of the spokes